iconv_set_encoding deprecated on PHP 5.6

Problem/Motivation

The db log is now full of error messages:
Deprecated function: iconv_set_encoding(): Use of iconv.internal_encoding is deprecated in MarketplaceWebServiceProducts_Client->__construct() (line 848 of /home/vnb/public_html/sites/all/modules/amazonMWS/libraries/nonapod/AmazonMWS/MarketplaceWebServiceProducts/Client.php).

I claim this was triggered by a hoster changing the default PHP version to 5.6. The error is not reported on PHP 5.4.3

Note that the actual error is in the external Nanopod library code and not the MWS module.

The offending code is:

        iconv_set_encoding('output_encoding', 'UTF-8');
        iconv_set_encoding('input_encoding', 'UTF-8');
        iconv_set_encoding('internal_encoding', 'UTF-8');

Proposed resolution

Not sure? I have not yet investigated the fix.